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Mobil 15w50 in 0w20 engine. #4457199
07/12/17 11:08 AM
07/12/17 11:08 AM
Joined: Jan 2016
Posts: 849
NC
Vladiator Offline OP
Vladiator  Offline OP
Joined: Jan 2016
Posts: 849
NC
My engine's oil cap recommendation states 0w20. I have been using Pennzoil 0w40 SRT for quite some time. Last oil change I switched to Mobil 1 15w50, just for S&G. I drive a lot and have a lot of idling time too. On average I go through 1 tank of gas per day. So if any changes take place - I notice them right away and can confirm if the change is permanent, or a one-time spike.

Here are the results of Mobil1 15w50 in 2009 Scion xB:

- Fuel economy did not take a hit over the past 7 tanks of gas, compared to the SRT 0w40. I was surprised, because I was under the impression that SRT 0w40 is a very "light" 40w and the 15w50 is a very "heavy" 50w. Expected an MPG drop, but that did not happen.

- Really enjoying the smoothness of throttle response in the lower RPM range. Feels like the engine gained some torque. Can't explain why... Better ring seal?... BUT hate the slight HP loss in the upper RPM range. Very minor, but the loss is there.

I will run this oil for 7k miles (my longest OCI yet in this vehicle) and will send it off for a UOA.

Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457207
07/12/17 11:17 AM
07/12/17 11:17 AM
Joined: Apr 2017
Posts: 515
Fort Worth TX
TheKracken Offline
TheKracken  Offline
Joined: Apr 2017
Posts: 515
Fort Worth TX
What are you trying to do here? Or did you just find a really good price?


2011 Prius 96k miles RLI 5w20
97 Toy T100 4x4: amsoil 0w20 242k Miles
04 Toy Sienna awd: Pennzoil 0w20 281k Miles
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457212
07/12/17 11:24 AM
07/12/17 11:24 AM
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
Back when I first started to drive, put 20W50 in my Civic (that called for 5W30) cause I drove the [censored] out of it, and someone said I should. Six months later spun a couple rod bearings.

Last edited by mightymousetech; 07/12/17 11:25 AM.

Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457214
07/12/17 11:30 AM
07/12/17 11:30 AM
Joined: Mar 2008
Posts: 5,964
South Florida
bubbatime Offline
bubbatime  Offline
Joined: Mar 2008
Posts: 5,964
South Florida
Dont stop now!! SAE 60 and SAE70 are just right around the corner!!


17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
10 Acura TSX 2.4 Maxlife Syn 5W30
06 GMC Sierra Nextgen 10W30


Re: Mobil 15w50 in 0w20 engine. [Re: mightymousetech] #4457215
07/12/17 11:30 AM
07/12/17 11:30 AM
Joined: May 2008
Posts: 6,298
Easton, PA
lexus114 Offline
lexus114  Offline
Joined: May 2008
Posts: 6,298
Easton, PA
Originally Posted By: mightymousetech
Back when I first started to drive, put 20W50 in my Civic (that called for 5W30) cause I drove the [censored] out of it, and someone said I should. Six months later spun a couple rod bearings.


that might have happened anyway regardless of what weight oil was in there. the other reason could have been cold flow into the greatly needed areas when cold?


2017 Mercedes-Benz C300 4matic coupe 2.0 turbo
2016 Lexus RX 350 Autumn Shimmer AWD
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457227
07/12/17 11:41 AM
07/12/17 11:41 AM
Joined: Dec 2006
Posts: 19,119
Dallas,Tx USA
aquariuscsm Online content
aquariuscsm  Online Content
Joined: Dec 2006
Posts: 19,119
Dallas,Tx USA
I'm a thick oil guy,but I think thin oils have their place,in 4cyl engines. The thickest I'd go is 5W30.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 5W20

Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457234
07/12/17 11:50 AM
07/12/17 11:50 AM
Joined: Jun 2003
Posts: 2,771
BC, Canada
userfriendly Offline
userfriendly  Offline
Joined: Jun 2003
Posts: 2,771
BC, Canada
Thin oil in small engines and thick oil in big engines aquariuscsm? Sounds just like tired trucker... "10w30 in a 13 liter jerking 80,000 pounds on 10w30", implying that a Duramax should only need 0W16.

Last edited by userfriendly; 07/12/17 11:50 AM.
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457237
07/12/17 11:52 AM
07/12/17 11:52 AM
Joined: Oct 2015
Posts: 2,798
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline
Joined: Oct 2015
Posts: 2,798
Balearic Islands , Spain
I run 20W-50 in an engine spec'd for 10W-40 with no issues, and it's a small 1124cc gas engine and i have not noticed any drop in fuel economy either.


1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.

Finnish expat in Spain.
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457242
07/12/17 11:58 AM
07/12/17 11:58 AM
Joined: Jan 2009
Posts: 13,979
Illinois
tig1 Online content
tig1  Online Content
Joined: Jan 2009
Posts: 13,979
Illinois
In 1978 I put M1 5-20 in my Chevy engine calling for 10-40 when I lived in Maine. In cold temps(-5 to -20F) the lifters clattered awful on cold start with the 10-40. After the switch my engine ran smoother and all of the lifter clatter stopped, a little MPG was noticed, and I was able to increase my OCI to 10K without an issue.


2007 Ford Fusion 235,000 miles
M1 0-20 EP
2017 Ford Fusion 60K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and Valvoline LV
M1 10-30 in all OPE
MC filters

Re: Mobil 15w50 in 0w20 engine. [Re: aquariuscsm] #4457251
07/12/17 12:04 PM
07/12/17 12:04 PM
Joined: Jan 2016
Posts: 849
NC
Vladiator Offline OP
Vladiator  Offline OP
Joined: Jan 2016
Posts: 849
NC
Originally Posted By: TheKracken
What are you trying to do here? Or did you just find a really good price?

I had a few quarts laying around from last year's Autozone clearance sale. My OPE have a lot of QuickSilver 25w40 stashed for it, so I decided to use the 15w50 in the DD.

Originally Posted By: mightymousetech
Back when I first started to drive, put 20W50 in my Civic (that called for 5W30) cause I drove the [censored] out of it, and someone said I should. Six months later spun a couple rod bearings.

What time of the year was it? It's gonna be above 70F here for a while, will hit triple digits soon. So no cold starts to worry about. And the hot temps and frequent idling should keep the viscosity on the lower end.

Originally Posted By: bubbatime
Dont stop now!! SAE 60 and SAE70 are just right around the corner!!
If I get Castrol 10w60 for free or less than $2/qt - I'll dump it in without thinking twice about it. But that's about as viscous as I'll ever go...

Originally Posted By: aquariuscsm
I'm a thick oil guy,but I think thin oils have their place,in 4cyl engines. The thickest I'd go is 5W30.
I see what you mean, but at the same time most of Europe (slightly colder climate for the most part) runs on 10w40-20w50 in sub-2L engines until the cars rust out. And most, if not all, Mitsubishi Evo 4-cylinders run on 20w50. According to Evo forums that is... Yes, my engine is nothing like an Evo, but still fits in the 4-cyl topic.

Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457255
07/12/17 12:05 PM
07/12/17 12:05 PM
Joined: Sep 2014
Posts: 2,177
US-WA
Dyusik Offline
Dyusik  Offline
Joined: Sep 2014
Posts: 2,177
US-WA
I run 15w40, as thick as 10w50 before in a 1.0L 4 cylinder that revs up to 15.5k rpm, I'm sure my engine tighter than a plane Jane 4 banger designed to putt to the grocery store...


95 Cherokee 190K DELO 10W30, XG8
07 IS250 103K Napa 10w30, FULL
04 YZF-R1 19K DELO 15w40, XG7317
99 HD XL1200S 21K VR1 20w50, NG1515
14 RX450h 35k PP MIX, NG7047
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457256
07/12/17 12:06 PM
07/12/17 12:06 PM
Joined: Sep 2004
Posts: 7,814
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,814
Marshfield , MA
I would use 20w 50 in any car with a carburettor. 20w50 gives safety margins over a thinner oil. When a leaky radiator led to a hole detonating a hole in #4 piston, the rod bearing and journal were pristine. I attribute this to the 20w50 Castrol I was using in the Datsun 1.6 . I dropped to 10w 30 for winter.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Mobil 15w50 in 0w20 engine. [Re: FordCapriDriver] #4457258
07/12/17 12:07 PM
07/12/17 12:07 PM
Joined: May 2014
Posts: 1,388
Minnesota
philipp10 Offline
philipp10  Offline
Joined: May 2014
Posts: 1,388
Minnesota
Originally Posted By: FordCapriDriver
I run 20W-50 in an engine spec'd for 10W-40 with no issues, and it's a small 1124cc gas engine and i have not noticed any drop in fuel economy either.


Guys...if there was a decrease in fuel economy it would be in the sub 1% range. I doubt your highly calibrated instruments (gas pump) would be accurate enough to notice...

Re: Mobil 15w50 in 0w20 engine. [Re: philipp10] #4457265
07/12/17 12:14 PM
07/12/17 12:14 PM
Joined: Jan 2016
Posts: 849
NC
Vladiator Offline OP
Vladiator  Offline OP
Joined: Jan 2016
Posts: 849
NC
Originally Posted By: philipp10

Guys...if there was a decrease in fuel economy it would be in the sub 1% range. I doubt your highly calibrated instruments (gas pump) would be accurate enough to notice...

I once tried Valvoline 5w40 MST in my previous vehicle with 1zz-Fe engine. It felt like I was pulling a 5000 lbs trailer and my MPG decreased by 30-35% until next oil change. Needless to say it was a shorter OCI due to listed factors.

Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457318
07/12/17 01:21 PM
07/12/17 01:21 PM
Joined: Dec 2006
Posts: 19,119
Dallas,Tx USA
aquariuscsm Online content
aquariuscsm  Online Content
Joined: Dec 2006
Posts: 19,119
Dallas,Tx USA
My reasoning,my gf had an old high mileage (200k+) Probe that used oil like it was going out of style. I tried 20W50 in it once and it made that slow car even slower haha. On the other side,my friend used 20W50 in his old 350 V8 Nova and you couldn't tell any difference.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 5W20

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